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There have been many great rivalries throughout history: Foreman and Ali, the Celtics and the Lakers, Less Filling and Tastes Great, the list goes on and on.

Add to it the occasional Twitter sparrings of David Roberts and Steve Everley. Roberts is a reporter for environmental news site Grist, and Everley is the manager of policy research at American Solutions, a policy group founded by Newt Gingrich.